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A 184 mW Fully Integrated DVB-H Tuner With a Linearized Variable Gain LNA and Quadrature Mixers Using Cross-Coupled Transconductor

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9 Author(s)
Iizuka, K. ; Adv. Technol. Res. Labs., Nara ; Kawamura, H. ; Fujiwara, T. ; Kagoshima, K.
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A fully integrated direct conversion DVB-H tuner is realized in a 0.5-mum SiGe BiCMOS technology. To meet the stringent linearity requirement while keeping low power consumption, novel linearization techniques for a variable-gain low-noise amplifier (VG-LNA) and a mixer are proposed. The proposed linearized VG-LNA has a variable gain range of over 50 dB, noise figure of less than 2.6 dB over the frequency range from 200 to 1000 MHz, and IIP3 of more than -10 dBm at a current consumption of 2.1 mA. The quadrature mixer with the proposed linearization technique achieves OIP3 of more than 25 dBm at a current consumption of 5 mA. In addition, a new offset-cancel feedback is introduced for the baseband block of a direct conversion receiver, which keeps the high-pass cutoff frequency independent of the baseband VGA gain. The fabricated tuner IC satisfies all the DVB-H requirements at a power consumption of 184 mW

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Solid-State Circuits, IEEE Journal of  (Volume:42 ,  Issue: 4 )